350 ci engine in TD-9 in IH Engines Posted May 31 If it was me and I did not plan on using the dozer much I would just swap the better head onto the 335 motor. I do not believe that there was a huge performance difference between the two engines. The TD-9 engine and sleeves are also getting very expensive. Last time I checked they were selling for $500.00 per hole. Another option would be to get your 4-3/8 inch sleeves bored out to 4-1/2 inches and clean up your old pistons. Rings for either engine are still readily available through Hastings, but not cheap.